Juno Pier sea temperatures peak in the range 28 to 30°C (82 to 86°F) on around the 6th of August and are at their lowest on about the 10th of February, in the range 21 to 24°C (70 to 75°F). Year round warm sea temperatures at Juno Pier climb to their highest in the first week of August. Even then a rash vest and board shorts should be fine for surfing at any time of year. Juno Pier sea temperatures are always warm but dip to their lowest in early to mid February. You'll need a 2mm neoprene top or a shorty at dawn/dusk or if it's windy.